CN106165008A - Scan method for display device - Google Patents

Scan method for display device Download PDF

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Publication number
CN106165008A
CN106165008A CN201480077875.XA CN201480077875A CN106165008A CN 106165008 A CN106165008 A CN 106165008A CN 201480077875 A CN201480077875 A CN 201480077875A CN 106165008 A CN106165008 A CN 106165008A
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China
Prior art keywords
frame
line
pixel
refreshing
view data
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Chinese (zh)
Inventor
乔治·梅尔尼克
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3618—Control of matrices with row and column drivers with automatic refresh of the display panel using sense/write circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G09G3/3644—Control of matrices with row and column drivers using a passive matrix with the matrix divided into sections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3666—Control of matrices with row and column drivers using an active matrix with the matrix divided into sections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0213—Addressing of scan or signal lines controlling the sequence of the scanning lines with respect to the patterns to be displayed, e.g. to save power
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/10—Special adaptations of display systems for operation with variable images
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Abstract

A kind of method providing display driving active array type.Matrix 100 includes the line L with matrix1‑LMThe addressable pixel being associated with row.Method includes, utilize line timing LT determined by the quantity by base frame rate BR of preliminary election and the line M of matrix that view data is write matrix, determine the frame rate N frame of the extension of all pixels for addressing matrix, and provide by the write of view data was distributed within the time period limited by the frame rate N frame extended all of pixel the batch (-type) of preliminary election to refresh IR.

Description

Scan method for display device
Invention field
Present invention generally relates to the field of source array liquid crystal display, more particularly relate to drive active matrix Liquid crystal display and the addressing method of corresponding display device.
Background of invention
AMLCD (AMLCD) is well known in the art, and generally includes row address line and row Address wire, they are the most spaced apart and intersect each other with an angle, thus form multiple cross points pixel, should Cross point pixel can be by applying the suitable electromotive force between the row address line tackled mutually and column address conductor optionally to be sought Location.Active matrix (AM) addressing method can be non-by adding in the line of each pixel and the cross point of alignment (being connected in series) Linear Control element (such as switch) realizes.Thin film transistor (TFT) (TFT) is generally arranged to acting on excitation or with its other party Formula addresses the switch element of corresponding pixel electrode.The use of switch is expert at during the addressing time and is stored at pixel by use Electric charge be pixel provide 100% dutycycle.Switch is generally controlled by two pulse signals, and this pulse signal is by external drive Circuit, line driver and row driver produce.The display of matrix addressing can addressed next line every, i.e. row is at frame time The selection grid impulse that period is managed by scan clock (CKV) scans successively.The grid impulse of the row selected is each by " on " The switch TFT of pixel, and the view data (voltage) to be provided by row driver is charged by reservior capacitor simultaneously.? After the space time (hereinafter referred to as line timing LT), the negative edge one of row grid impulse is transmitted, and switch TFT is just 'switched ', And pixel will be with row driver isolation until next frame time when view data is refreshed.
In normal display operation, and particularly in HDTV applies, for video display application LCD image frame extremely Few 60 frames/second is refreshed.Because image change than human eye reaction faster, so eyes feel that continuous print moves.? In AMLCD reduce power consumption generally by low frequency refresh should be for realizing.The lowest power consumption of AMLCD is not having backlight In the case of the most only by selecting refreshing only once per second to reduce nearly 2 orders of magnitude, thus longevity can be directly contributed to The battery operation of life.If display application only needs static state and the most binary image, then refreshing frequency (RF) is even Lower frequency can be lowered to save even more electric power.
The simplest method using refreshing frequency RF reduced is to slow down scan clock (CKV).In this case, institute The dutycycle of wired particularly grid address wire keeps identical, but is only operated at stability at lower frequencies.Owing to display itself is Simple capacitor, therefore this serves good effect for power consumption, unless parasite current and leakage current are high.Described above System in the enough power realizing display reduces, be typically effective.But, exist for having efficient improvement The demand of refresh scan method.In order to realize such operation, it is necessary to use scan method or refresh scan pattern and LC behaviour Operation mode, to reduce the observability of every frame scan.Herein, we have proposed scan method, it will reduce frame or line refresh scan The observability of pattern, and may improve the LCD life-span under low-power operation.
Summary of the invention
The present invention aims at a kind of refresh scan method providing at improvement with high effect.
First object according to the present invention, it is provided that a kind of method of display driving active array type.Matrix includes Line L with matrix1-LMThe addressable pixel being associated with row.Method includes: utilize by base frame rate BR of preliminary election and matrix View data is written to matrix by line that quantity M of line determines timing LT, determines the extension of all pixels for addressing matrix Frame rate N-frame, and by the write of view data being distributed within the time period limited by the frame rate N-frame extended All of pixel provides the batch (-type) of preliminary election to refresh IR.The method of the refreshing proposed relates to the LCD module as being present in 60Hz In the identical or holding of faster line timing, use batch (-type) to refresh simultaneously.Utilize batch (-type) refresh scan method, kept Express Order Wire timing cause the reduction of dutycycle of gate line.Therefore, the grid that wherein electronics is evicted from from the channel region of TFT Polar curve annealing (negative voltage condition) is expanded, and may cause more preferable TFT aging condition during the life-span of panel.
Additionally, in addition to providing alap grid to degenerate, the holding of Express Order Wire timing (that is, quick scanning times) The invisible of image refreshing is advantageously caused especially with fast scan mode (it is described in further detail below).? In the case of not having material alteration, this causes the potential application of existing AMLCD TFT backplate to become as price tag in turn The low-power consumption still image application of display etc..
According to the embodiment of method, the frame rate N-frame of extension is based on selected refreshing constant N.Refresh constant N to be chosen To provide low batch (-type) to refresh, its power consumption transferring to reduce display, provide of a sufficiently low observability, i.e. wherein brush simultaneously New scanning keeps sightless alap refresh rate.Extension frame rate N-frame according to N-frame=N BR by refreshing constant N Determining with the product of base speed BR, wherein BR was limited by the time needed for addressing M+O line, and wherein O is the overscanning of display.
According to the embodiment of method, refresh constant N and determine based on view data.
According to the embodiment of method, refresh constant N and select based on the crosstalk being associated with view data.For showing The image of relatively low crosstalk increases the value refreshing constant N and keeps invisible by improving the simultaneously refreshed scanning of power saving.Such as, white Black in view data typically exhibits the crossfire value lower than reversion.
The embodiment of the method according to following also referred to as fast scan mode, is allocated the write of view data Step includes: address wired L during the 1st frame successively1-LM, keep by the frame refreshing the predetermined quantity that constant N limits, and Subsequently by addressing wired L during nth frame successively1-LMCarry out refresh picture data.Fast scan mode advantageously provides 60Hz or faster single frames refresh scan are for the observability reduced.Due in the long holding week being written between display Phase (N number of base rate frame), advantageously and according to the embodiment of method, (alternatively by sleep timer control, it is excellent for resting state The retention time by being associated with refreshing constant N is selected to limit) during hold period, it is applied to drive electronics, in order to Bigization power is saved.
According to the embodiment of the following also referred to as method of full frame slow scan mode, method also includes determining line clock time The step of CKV.The step being allocated the write of view data includes: address wired L successively1-LM, the most after addressing Keeping/wait by the CKV refreshing the quantity that constant N determines before continuous line, this is conducive to provide the refreshing observability of reduction.
The embodiment of the method according to following also referred to as fragmented frame slow scan mode, is carried out the write of view data point The step joined includes: matrix is divided into M/N Scanning Section, and each successive frame is addressed to the follow-up line of each sweep segment Until all of line is the most addressed, this is conducive to provide the refreshing observability of reduction.
Full frame slow scan mode and fragmented frame slow scan mode contribute to battery-operated label.Even if passing from battery The electric charge delivering to display is actually identical with for other display, but slow scan mode provides the relatively low of display Average driving current, this can result in the more long-life battery depending on that battery chemistries forms in turn.Slow scan mode Also can be conducive to such as that those have some image of low spatial frequency conversion, further suppress refreshing when being used can Opinion property.
According to the embodiment of method, the method is additionally included in during batch (-type) refreshes and utilizes frame reversion, row reversion, line reversion Or pixel inversion.Which increase the space average of any flicker observability on display.The inversion scheme suitably selected is by table Reveal the minimum crosstalk with minimum flicker observability.
According to the embodiment of method, batch (-type) refreshes the N-frame for selected quantity and also performs in identical polar, and this enters One step provides the power of improvement and saves.In prior art, modal method is reversed polarity at each refreshing.This consumes More electric power, this is because each pixel capacitor needs maximum electric current with reversed polarity.Identical polar refreshes and needs Electric current that will be the least also provides chance to carry out refreshed image, returns to its state do not degenerated.What identical polar refreshed makes By preferably balance so that display is not damaged by.It is to say, for each image, the identical polar of equal amount Frame is used in positive pole and negative pole.The refresh frame of these identical polars of maximum equilibrium quantity can result in the power joint of maximum Save.This quantity depends on the chemical composition and structure of display, and can be determined by.
According to the embodiment of method, batch (-type) refreshing also includes that consecutive identical polar group rate frame pixel is charged, and this is favourable In realizing maximum charge stability.
According to the embodiment of method, the charging of continuous base rate frame pixel only performs in each reversion frame.Use above institute The embodiment of fast scan mode described, the base rate frame of the identical polar of preselected number in polarity in the beginning of every N-frame During reversion addressed.Using the embodiment of slow mode, multiple lines are addressed and re-address.
According to the second aspect of the invention, it is provided that using the display device of the addressing method according to the present invention, it has With the identical advantage discussed above with reference to a first aspect of the present invention.
Accompanying drawing is sketched
Referring now to accompanying drawing and be more fully described the present invention, wherein:
Fig. 1 is the schematic diagram of the embodiment of the method utilizing fast scan mode according to the present invention；
Fig. 2 is the schematic diagram of the embodiment of the method utilizing full frame slow scan mode according to the present invention；
Fig. 3 is the schematic diagram of the embodiment of the method utilizing fragmented frame slow scan mode according to the present invention；
Fig. 4 is the full frame slow scan mode that the utilization according to the present invention has the charging of continuous base rate frame identical polar pixel The schematic diagram of embodiment of method；
Fig. 5 is the side that the utilization according to the present invention has the slow scan mode of continuous base rate frame identical polar pixel charging The schematic diagram of the embodiment of method；
Fig. 6 is the full frame slow scan mode that the utilization according to the present invention has the charging of continuous base rate frame identical polar pixel The schematic diagram of embodiment of method；And
Fig. 7 shows the crosstalk of instruction image dependence and measures according to the crosstalk of the N of the change of image.
The description of preferred embodiment
It is described more fully with the present invention below with reference to accompanying drawing.Following example are provided so that the disclosure will by example It is thorough and complete, and will reception and registration the scope of the present invention comprehensive to those of skill in the art.From start to finish, similar number Word refers to similar element.
Term:
Refreshing constant N is constant, and it is chosen so as to the extension frame time needed for providing according to idea of the invention.
Base speed BR is the fast timing utilized in scan pattern shown in this article.Below concept of the present invention In embodiment, base speed is selected as 60Hz.According to alternative embodiment, base speed also can be selected as faster or more slowly for The optimum performance of the particular display type being currently in use.
Line time LT is fixing in all scan patterns, and is added overscan by base speed BR divided by the line M in matrix The quantity retouching O determines:
LT=BR/ (M+O) equation 1
N-frame is frame rate determined by the time spent by each pixel in addressing LCD matrix.In this article In some embodiments, N-frame is arranged to N times of base speed BR, but also can such as select based on view data or crosstalk.As Really N=60 and base speed BR elect 60Hz as, then N-frame is 1 second, and it is equivalent to the batch (-type) refresh rate IR of 1Hz.
N-frame=N BR equation 2
According to current inventive concept, use when writing data into LCD matrix equal to or hold concurrently than the video being used in 60Hz Those lines addressing time faster Express Order Wire addressing time in the LCD display held, provide batch (-type) to refresh simultaneously.As above institute Stating, for frame scan pattern and line scan pattern, keeping the fast refresh time is favourable for the observability reduced, class It is similar to vision operation.There is presented herein three kinds of scan patterns: quickly scanning, the slow surface sweeping of full frame and fragmented frame slow scan.
Quickly scanning: the observability in order to reduce proposes and uses 60Hz or quickly the sweeping of single frames refresh scan faster Retouch.Referring now to Fig. 1, it is shown that according to the schematic diagram of the embodiment of the method utilizing fast scan mode of the present invention.Including With line L1-LMIt is schematically illustrated as display line L with the matrix 100 of the display arranging the addressable pixel being associated1-LM.At figure In 1, base speed BR N times the frame time N-frame of extension (be equivalent to) if time cycle on the butt rate frame distributed (#) 1 to N the line addressing when view data being write matrix 100 is illustrated.Employ by the line M's of the matrix according to equation 1 Line timing LT determined by quantity and base speed BR.During frame #1, information is written into the single base speed of whole display (60Hz) in scanning.View data subsequently at it by view data being write the single base of whole display during frame #N It is kept by refreshing the scheduled time that constant N is limited before speed (60Hz scanning) is refreshed again.For addressing matrix The extension frame rate N-frame of all pixels controlled by equation 2, and batch (-type) refreshes IR by means of by the write of view data There is provided with refreshing all pixels being assigned in limited extension frame rate N-frame.
Refresh constant N and can be chosen as arbitrary integer.According to the embodiment of method, refresh constant N and currently used base speed Rate BR is mated.In the exemplary embodiment, refreshing constant and be chosen as N=64 (01000000), it is about as much as refresh scan Between the N-frame of 1 second.The embodiment of the method according to the invention, the value refreshing constant N is determined by image information.According to inverting Method, distribution based on the information (that is, view data) on matrix is shown different degenerations by many images.The value of N Can be the most measured, and the data being the most such as stored in data base by retrieval are presented with each in image, To maximize power further to save.According to a further embodiment of the method according to the invention, the value of N can be by whole aobvious The ratio of two states on presentation surface and the maximum pixel density of white and black picture element are estimated.Provide look-up table, its Value N is determined based on these parameters for each image.
In an alternative embodiment, the length of N-frame changes based on view data and polarity inversion.There is the pole of low crosstalk Sex reversal scheme (such as frame reversion or row reversion) will have big N value.If the N value utilized is measured, then this value will be from Move and taken into account.Multiplier also can be associated with some polarity scheme for the purpose estimated.
According to the embodiment of fast scan mode, address together with Express Order Wire, quilt when frame is reversed in again refresh picture data Use, to realize alap charge accumulation in either polarity.Referring again to Fig. 1, in the base rate frame phase of a 60Hz Between, wired addressed in the 16ms being assigned.Ensuing N-1 frame is blank.Display is subsequently in pre-programmed Again it is refreshed with contrary polarity at the N+1 frame.Frame reversed polarity and the value of refreshing constant N due to other addressing each Being fixing for each image, therefore LC drives any chance being to balance and retain for image to be minimized.
The embodiment of the method according to the invention, scans together with quick mode, and identical polar refresh frame is also used.This is Display tolerance based on the charge accumulation about either polarity.If tolerance is high, then can use large number of identical polar brush New frame, thus save more electric power.
The embodiment of the method according to the invention, together with fast scan mode, have employed for realizing maximum charge stable Property successive frame identical polar pixel charging.
The embodiment of the method according to the invention, together with fast scan mode, have employed for reality in each reversion frame The successive frame pixel charging of existing maximum charge stability.
According to the embodiment of the method when utilizing fast scan mode, save to maximize power, fixed qty Identical polar image was refreshed before the polarity of reverse image.
Full frame slow scan mode: referring now to Fig. 2, it shows the schematic diagram of matrix 200 of display, this display Including with line L1-LMThe addressable pixel being associated with row, its center line L1-LMIt is schematically illustrated.The method according to the invention Embodiment, have employed full frame slow scan mode.Each frame is for the line L in display1-LM(OK) each in is in time It is bisected into.The timing controller equipment (Tcon) of LCD generates this time division equal to each line in addressing display Line clock CKV.In full frame slow scan mode, refreshing the CKV of the quantity that constant N determines as described above, it is in addressing It is skipped between next line.Therefore, if N=64, then 64 CKV are in addressed line L1Addressed line L afterwards2Process before, etc., And 64 frame times therefore corresponding to N-frame are scanned through the time of whole display.This has imitated when only slowing down display The solution of prior art that clock refreshes to provide low frequency, except each line is the most addressed with identical line timing, it will be Base speed (60Hz) place is addressed, regardless of the value refreshing constant N.In fig. 2, timeline is indicated on the right side of figure.Time Between at t=0, the First Line L of display1Addressed.If display has 200 lines, i.e. M=200, (ignoring overscanning), The most each line is addressed in 80um (base speed line time).Keep the example of N=64, then line L2At N 80us=5.12ms Addressed in next 80us increment, and all afterwards 200 lines are at 200 64 80us=200 5.12ms=64 After 16ms=1.024s addressed.Online L200Line L after addressed 5.12ms1Start next scanning.As discussed above , this reduces the dutycycle on gate line by the identical factor of N.Which results in more preferable grid behavior and pass through TFT channel captures less electronics to reduce device threshold drift.
Fragmented frame slow scan mode: according to the embodiment of method, have employed fragmented frame slow scan mode.Fragmented frame slow scan Pattern is similar to full frame slow scan mode, except addressing display in the next line closed on before without waiting for N number of CKV, N Individual line was skipped before next line is addressed.Owing to CKV is limited by the quantity of line M and the frame time of 60Hz, therefore line Total quantity divided by refresh constant N (M/N) in each 60Hz frame separated by N number of line equalization addressed.In next 60Hz frame, The each line being close in the most addressed line is addressed, and therefore after N number of frame each line in display by finally Addressing.
Fig. 3 very diagrammatically show the operation of fragmented frame slow scan mode.Keep the example of N=64, the display of 200 lines Being divided into 3 equal segmentations of 64 lines, remaining segmentation only comprises 8 lines.First Line in each segmentation is first In 60Hz frame addressed.It is similar to use the example of the full frame slow scan mode of this display, line LNOnline L1N afterwards 80us=5.12ms addressed, line L subsequently2NWith line L3NEach impartial in the time separate, complete a 60Hz frame.Line L2、LN+1、L2N+1And L3N+12nd 60Hz frame is all addressed.When completing n-th 60Hz frame, owning in display Line is the most addressed.Next slow scan mode frame in next 60Hz frame with line L1Immediately begin to.
According to the present invention, scan pattern described above, polarity and inverting method are used in embodiment, In addition to contributing to reducing power consumption, its observability that also can affect frame or line refresh scan pattern.Kept many before reversion Identical polar in the individual refresh cycle contributes to power and saves, this is because the pixel that current consumption is direct and addressed (as Element capacitor) in voltage difference be directly proportional.Therefore, if the low and identical polarity that leaks in pixel is used for refreshed image, then Display does not has power attenuation.
According to the embodiment of method, low crosstalk polar inversion method is employed for the longer retention time, and it causes Even lower power consumption.Frame reversion typically exhibits minimum crosstalk, this is because all pixels are in each frame identical Polarity under be changed.This method is due to asymmetric drive condition (particularly when leakage height), it is also possible to cause high Refresh observability.Column and row or pixel inversion can reduce this observability, but add crosstalk, thus reduce the retention time and damage Consume more power.
Contribution to image degradation
In its simplest form, each pixel is modeled as independent capacitor.It is applied to this capacitor Voltage can be stored under ideal conditions indefinitely.Therefore, ideally, image will not be degenerated over time, and And therefore to rewrite identical image will be the most sightless.In practice, there is no this situation due to leakage and/or crosstalk.
Leakage: TFT self has limited and measurable cut-off current.Although this electric current is the least, usually 10- 13A, but its degeneration that be enough to facilitate the voltage on the pixel capacitor being stored between refresh frame.Close due to addressed line With the finite resistive rate by these lines with the material of pixel electrode isolation, other leakage paths there is also.Modal leakage is Owing to being stored in the decay towards the voltage in the pixel on ground, because ground is chosen as the reference used by reservior capacitor Voltage.
Crosstalk: crosstalk is the figure in another part of display at the image contributions being just written in a part for display Occur during picture.The all information being transferred to other pixels on alignment may affect the picture of the isolation in another part of image Voltage on element capacitor.Here, the line between the defining of crosstalk and leakage may thicken.Do not having on pixel capacitor Voltage in the case of the leakage paths of the line that addresses every other pixel, will there is no crosstalk.Behaviour at nominal 60Hz In work, display is different by showing in the image field in the minds of in the display between two boxes of different luminance levels Brightness, secondly shows different brightness on the side of image not having figuratum box.Box is right at top and bottom Together, in order in ambient field, create sharp transition.
The sweep speed that is defined in of crosstalk and leakage is lowered to even more obscure well below can become during 60Hz, its Middle image by actively write display Anywhere time will the image of impact certain position interested.In these feelings Under condition, the combination of two effects (crosstalk and leakage) can act on changing in the brightness measuring position.
Not exclusively pixel charging: only voltage is just applied to each pixel when gate line height.This pulse for～10us It is movable.On the other hand, LC material will take for 2-10ms to this change responding in voltage.Voltage at LC material two ends Increase cause redirecting of LC material, which increase the dielectric constant (ε of pixel capacitorΙΙ>εΙ) and thus its electricity Hold, thus reduce the voltage at pixel two ends.This change in voltage can be the total divisor (full of two or more factor).Bigger voltage is increased to by pixel capacitor, final fully charged picture for the follow-up refresh frame of identical image Element, if but these frames are delayed by save power, then and picture quality will be impaired during this change.
Although sufficiently large reservior capacitor can not be completely eliminated degeneration forever, but it also will slow down this degeneration.Another Selection is to address more than one frame at nominal 60Hz refresh rate when changing image.
Positive frame and the optic response of the unsymmetry of negative frame: LC identical amplitude but at opposite polarity addressed time the most not It is identical.When sufficiently high refresh rate (60Hz and Geng Gao) place is addressed, eyes feel the brightest of these level Degree, but when slowing down, flicker can be felt.Crosstalk is principal element for this unsymmetry, but has many other reasonses. TFT connects the unsymmetry of (ON) electric current can become problem, especially for positive frame.Connect owing to being applied to the voltage of pixel The amplitude of nearly grid impulse, therefore threshold value impact also will play a role.Additionally, cell gap (cell gap) itself can be to LC material Material plays the effect of screen potential.The organic material of cell gap of composition pixel capacitor comprises and has different mobility and catch Obtain the ion of two kinds of polarity of coefficient.Depending on these chemical compositions, the most lesser amount of DC in pixel may result in shielding electricity The development of gesture.What is worse, screen potential can be substantially dynamic；It is increased or decreased in time according to external condition.
The best mode hiding this unsymmetry is to utilize pixel and line inversion scheme.The method according to the invention Embodiment, inversion scheme usually drives indicator screen (that is, matrix) by opposite polarity in each (write) frame On the half of pixel use.This adds space average to the time average of high refresh rate, visible to completely inhibit flicker Property.These methods also result in more crosstalk due to the bigger differential voltage between the pixel in same number of frames.
LC pressure sensitive: nowadays on market, typical LCD is usually designed to white.When there is no voltage or low-voltage quilt When being applied to LC material, image is bright.At higher voltage, LC is driven to its black state.90 degree of twisted-nematics (nematic) it is typically used as optical modulator.
For all electromotive forces about asymmetric drive condition discussed above, what no matter does to guarantee voltage pair Title property, some form of flicker may be the most visible.In order to suppress the observability of this unsymmetry, dark state is for electromotive force In the susceptiveness of change should be the biggest.90TN pattern is unsatisfactory, but exists and the black and white shape reducing susceptiveness " threshold value " that both states are associated.In white states on 90TN, there is voltage threshold, it must start to redirect at LC It was exceeded before in electric field.Most of LC materials show this threshold value at about 1V.Under dark high pressure conditions, once LC Be re-introduced into the most completely in electric field, then the slope of brightness obvious responses in pressure drop.The susceptiveness of this state takes Certainly in the driving voltage of actual darkness state.If this voltage be enough to beyond the change in the slope of brightness response curve, then its Effective threshold value can be considered.
Consecutive identical polarity frame addresses: when reversion, pixel redirects not being charged to it the most electric due to slower LC Gesture, as described by above under the incomplete pixel of paragraph is charged.This assumes that some degenerations of LC orientation have occurred or image Information is the most altered.Owing to LC redirects, pixel capacitance changes.Be towards field direction if redirected, then electric capacity increases And reduced by voltage determined by electric charge stored during initial addressing.
According to the present invention, the most selected (quickly, full frame is slow, fragmented frame is slow) scan pattern, there is effectively usable N Individual frame, does not wherein have pixel addressed on LCD, and therefore, in any continuous print frame, the pixel being previously written can be when this Re-addressed during between.If this completes under identical polar, the most extra power consumption is minimum, and ensure that required picture Element electric charge.This is referred to as the charging of continuous base frame rate identical polar pixel, and after polarity inversion or image modification, especially Being when being driven into black in the LCD of normal white, it is favourable.Guarantee all pixels be completely charged in black by Can result in the longer retention time in more preferable charge stability, and extra power therefore is saved, particularly behaviour In the long period made.
Referring now to Fig. 4 and Fig. 5, it is described more particularly below and there is the charging of continuous base frame rate identical polar pixel Embodiments of the invention, i.e. the increase of polarity frame identical at base frame rate is to charge more fully to pixel.As institute Discussing, this is most useful for black image information, the wherein change in the optic response of LC at sufficiently high voltage Be equivalent to threshold value.
Fig. 4 shows the use of the consecutive identical polar group rate frame in fast scan mode.Threshold constant N is chosen The most effectively to provide the retention time.Additionally, multiple base rate frame (being defined by the x in Fig. 4) can prior to keep time Between addressed in identical polarity.This will ensure that and all pixels are fully charged to the level that they are required, and can with Under all inversion scheme be used together: frame, column and row and pixel.In the diagram, the first frame #1 is addressed in " just " polarity.After X continuous base rate frame is addressed in identical polar.This Figure only shows two frames, but this numeral is selected for Good operation.Its should less than but be not limited to the sub-fraction of the sum of the frame defined in the N-frame.
In slow scan mode, the base rate frame time (BR) is divided into the line time (CKV), and it is by the number of the line in display The quantity measuring and defining the top of overscanning and " line " of bottom determines: CKV=BR/ (line+overscanning).Therefore, N-main feed line Time can be considered as N CKV.In the full frame slow scan mode that Fig. 2 as previously explained is explained, do not have in identical polar Re-address.Each line is addressed in a CKV, and when using the holding of N CKV subsequently before next line is addressed Between.In full frame slow scan mode, next line is the next line in sequence (a-> a+1), and wherein " a " is the most addressed line Count.
Fig. 5 is the full frame slow scan mode that the utilization according to the present invention has the charging of continuous base frame rate identical polar pixel The schematic diagram of embodiment of method.Provide continuous base frame rate charging example (x=3).In the first base frame, only Line L1Addressed.Its subsequently in identical polar each middle in the continuous base frame that x is follow-up re-addressed.Next N-frame in, each line re-addresses with x continuous print but is again addressed successively in opposite polarity.
In fragmented frame slow scan mode, next line is the First Line in next sweep segment (a-> a+N).Base speed continuously The addressing of rate line, by using N CKV retention time to utilize its advantage, had previously been addressed to re-address in identical polar Line.The number of times that line is re-addressed can be defined as x again.Fig. 6 shows about full frame slow scan mode on the right side of figure Timing.Timing sequence about fragmented frame slow scan mode is identical with the timing sequence of full frame slow scan mode, and only The line re-addressed changes.The most just selected x CKV for the x re-addressing more than a before a line of addressing Individual line, for a line initially address and re-address timing sequence (for write and refresh timing sequence) by It is set to t=((a+x) N-x) CKV, for x=0 to x-1.Line timing sequence about x=3 illustrates in Table 1.
Table 1
It can be seen in table 1 that First Line (a=0) is addressed at t=0.Second line (a=1) is at N CKV and 1CKV Addressed, First Line is re-addressed at (N-1) CKV before it.3rd line (a=2) is in 2N CKV is in this N-frame Initially addressed.One CKV clock cycle, the second line is re-addressed at (2N-1) CKV for the first time before it, and the One line is re-addressed for the 3rd time for it and last line is the most before it at (2N-2) CKV.When the 4th line is at 3N CKV Time addressed, the 2nd line and the 3rd line were re-addressed in 2 clock cycle previously, but line 1 is no longer re-addressed, and this is Due to its most addressed 3 times.
Table 2
The quantity that timing sequence is identical and the most wired with each sweep segment in fragmented frame slow scan mode changes. Line L1Become line LNAnd line L2Become line L2N, etc..In order to draw the timing indicator for this pattern, the line in display total The value of number and N must be predefined.Select N=64 and M=200, following for the timing indicator of fragmented frame slow scan mode Shown in table 2.
Referring now to Fig. 7, it is illustrated that indicate the crosstalk of image dependence and measure according to the crosstalk of the N of the change of image.? In this graphical representation of exemplary, according to the present invention, there are two different refreshing constant N when utilizing1And N2Fast scan mode time, Illustrate that the image of price tag (see Fig. 7) is measured relative to crosstalk Xtlk.When recording optic response in both images, Use identical measurement position.Measure position in both images in having white states (black (the black in white White) matrix area) is selected.In the figure 7, when using refreshing constant N respectively1=128 and N2When=256, for Respective image as measure position time function measured by normalization optic response together with for N2=256 The measurement of complete tag drawn.Little modulation in the crosstalk scanning of the N=128 in note curve figure.It is N=256 The twice of the frequency of the big modulation in measurement.Visible crosstalk is not had for the white on label image.String at N=256 Modulation measured by disturbing in image is close to 15%, and is therefore also obviously even with white states.When by 2 Factor reduce N time, modulation be effectively zero, the most invisible.White modulation in label image even for N=256 is also It is nearly zero.Image comprises the black data more less than crosstalk image above and below.Black state is not shown for N= Modulation in the label image of 256, and the most relatively low N value by be still necessity to reduce pseudomorphism.
Although the present invention is explained and describes in accompanying drawing and description above, but these illustrate and retouch State and be considered illustrative or exemplary and nonrestrictive；The invention is not limited in the disclosed embodiments.Art technology Personnel when putting into practice the present invention for required protection by research accompanying drawing, disclosure and appended claims it will be appreciated that also Realize other modification of open embodiment.In detail in the claims, word " includes " being not excluded for other element or step, and Indefinite article " one (a) " or " one (an) " are not excluded for plural number.Some measure is described in mutually different dependent claims Indisputable fact do not indicate that the combination of these measures cannot act as advantage.Any reference in claim should not be construed as Restriction scope.

Claims (14)

1. the method driving the display of active array type, described matrix includes the line L with described matrix1-LMRelevant with row The addressable pixel of connection, described method includes:
Line timing LT determined by quantity M by base frame rate BR of preliminary election and the line of described matrix is utilized view data to be write Described matrix；
Determine that the frame rate N-frame of extension is for all pixels addressing described matrix；And
Own by the write of described view data being assigned within the time period limited by the frame rate N-frame of described extension Pixel, provides the batch (-type) of preliminary election to refresh IR.
Method the most according to claim 1, wherein, frame rate N-frame refreshing based on the preliminary election constant N of described extension.
Method the most according to claim 2, wherein, the frame rate N-frame of described extension is by described refreshing constant N and described The product of base speed BR determines.
Method the most according to claim 1 and 2, wherein, the frame rate N-frame of described extension changes based on view data.
Method the most according to claim 4, wherein, described refreshing constant N is based on the string being associated with described view data Disturb and select.
6. the described step according to the method described in any one the claims, wherein, the write of view data being allocated Suddenly include:
All of line L is addressed successively during the 1st frame1-LM,
The frame of the predetermined quantity that holding is limited by described refreshing constant N, and subsequently
By addressing all of line L successively during n frame1-LMRefresh described view data.
Method the most according to claim 6, is additionally included at least partly period of step of described holding by resting state It is applied to the drive electronics being used to address described matrix.
8., according to the method according to any one of claim 1-5, also include the step determining line clock time CKV, Yi Jiqi In, the described step being allocated the write of view data includes:
Address all of line L successively1-LM, wait, before line the most continuous, the quantity determined by described refreshing constant N Line clock time CKV.
9. according to the method described in any one in claim 1-5, wherein, described in the write to view data is allocated Step includes:
Described matrix is divided into M/N sweep segment, and
For each successive frame
Address the follow-up line of each sweep segment, until all of line is the most addressed.
10. according to the method described in any one the claims, during being additionally included in the refreshing of described batch (-type), utilize frame to invert, Row reversion, line reversion or pixel inversion.
11. according to the method described in any one the claims, and wherein, described batch (-type) refreshes the extension for selected quantity Frame N-frame utilize identical polar to perform.
12. according to the method described in any one the claims, and wherein, the refreshing of described batch (-type) also includes consecutive identical polarity Base frame rate pixel is charged.
13. methods according to claim 12, wherein, described continuous base frame rate pixel is charged only in each reversion frame Perform.
14. methods according to claim 8, also include that continuous base frame rate pixel is charged, wherein, for writing of the n-th line The timing sequence entered and refresh is given as t=((n+x) N-x) CKV, and for x=0 to (x-1), wherein x is described n-th line The quantity of refreshing frequency.
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